binutils-gdb/bfd/plugin.c

612 lines
15 KiB
C

/* Plugin support for BFD.
Copyright (C) 2009-2015 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#if BFD_SUPPORTS_PLUGINS
#include <assert.h>
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#elif defined (HAVE_WINDOWS_H)
#include <windows.h>
#else
#error Unknown how to handle dynamic-load-libraries.
#endif
#include <stdarg.h>
#include "plugin-api.h"
#include "plugin.h"
#include "libbfd.h"
#include "libiberty.h"
#include <dirent.h>
#if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
#define RTLD_NOW 0 /* Dummy value. */
static void *
dlopen (const char *file, int mode ATTRIBUTE_UNUSED)
{
return LoadLibrary (file);
}
static void *
dlsym (void *handle, const char *name)
{
return GetProcAddress (handle, name);
}
static int ATTRIBUTE_UNUSED
dlclose (void *handle)
{
FreeLibrary (handle);
return 0;
}
static const char *
dlerror (void)
{
return "Unable to load DLL.";
}
#endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
#define bfd_plugin_close_and_cleanup _bfd_generic_close_and_cleanup
#define bfd_plugin_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
#define bfd_plugin_new_section_hook _bfd_generic_new_section_hook
#define bfd_plugin_get_section_contents _bfd_generic_get_section_contents
#define bfd_plugin_get_section_contents_in_window _bfd_generic_get_section_contents_in_window
#define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data
#define bfd_plugin_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
#define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data
#define bfd_plugin_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
#define bfd_plugin_core_file_matches_executable_p generic_core_file_matches_executable_p
#define bfd_plugin_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
#define bfd_plugin_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
#define bfd_plugin_get_lineno _bfd_nosymbols_get_lineno
#define bfd_plugin_find_nearest_line _bfd_nosymbols_find_nearest_line
#define bfd_plugin_find_line _bfd_nosymbols_find_line
#define bfd_plugin_find_inliner_info _bfd_nosymbols_find_inliner_info
#define bfd_plugin_get_symbol_version_string _bfd_nosymbols_get_symbol_version_string
#define bfd_plugin_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
#define bfd_plugin_read_minisymbols _bfd_generic_read_minisymbols
#define bfd_plugin_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
#define bfd_plugin_set_arch_mach bfd_default_set_arch_mach
#define bfd_plugin_set_section_contents _bfd_generic_set_section_contents
#define bfd_plugin_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
#define bfd_plugin_bfd_relax_section bfd_generic_relax_section
#define bfd_plugin_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
#define bfd_plugin_bfd_link_add_symbols _bfd_generic_link_add_symbols
#define bfd_plugin_bfd_link_just_syms _bfd_generic_link_just_syms
#define bfd_plugin_bfd_final_link _bfd_generic_final_link
#define bfd_plugin_bfd_link_split_section _bfd_generic_link_split_section
#define bfd_plugin_bfd_gc_sections bfd_generic_gc_sections
#define bfd_plugin_bfd_lookup_section_flags bfd_generic_lookup_section_flags
#define bfd_plugin_bfd_merge_sections bfd_generic_merge_sections
#define bfd_plugin_bfd_is_group_section bfd_generic_is_group_section
#define bfd_plugin_bfd_discard_group bfd_generic_discard_group
#define bfd_plugin_section_already_linked _bfd_generic_section_already_linked
#define bfd_plugin_bfd_define_common_symbol bfd_generic_define_common_symbol
#define bfd_plugin_bfd_copy_link_hash_symbol_type _bfd_generic_copy_link_hash_symbol_type
static enum ld_plugin_status
message (int level ATTRIBUTE_UNUSED,
const char * format, ...)
{
va_list args;
va_start (args, format);
printf ("bfd plugin: ");
vprintf (format, args);
putchar ('\n');
va_end (args);
return LDPS_OK;
}
/* Register a claim-file handler. */
static ld_plugin_claim_file_handler claim_file;
static enum ld_plugin_status
register_claim_file (ld_plugin_claim_file_handler handler)
{
claim_file = handler;
return LDPS_OK;
}
static enum ld_plugin_status
add_symbols (void * handle,
int nsyms,
const struct ld_plugin_symbol * syms)
{
bfd *abfd = handle;
struct plugin_data_struct *plugin_data =
bfd_alloc (abfd, sizeof (plugin_data_struct));
plugin_data->nsyms = nsyms;
plugin_data->syms = syms;
if (nsyms != 0)
abfd->flags |= HAS_SYMS;
abfd->tdata.plugin_data = plugin_data;
return LDPS_OK;
}
static const char *plugin_program_name;
void
bfd_plugin_set_program_name (const char *program_name)
{
plugin_program_name = program_name;
}
static int
try_claim (bfd *abfd)
{
int claimed = 0;
struct ld_plugin_input_file file;
bfd *iobfd;
file.name = abfd->filename;
if (abfd->my_archive)
{
iobfd = abfd->my_archive;
file.offset = abfd->origin;
file.filesize = arelt_size (abfd);
}
else
{
iobfd = abfd;
file.offset = 0;
file.filesize = 0;
}
if (!iobfd->iostream && !bfd_open_file (iobfd))
return 0;
file.fd = fileno ((FILE *) iobfd->iostream);
if (!abfd->my_archive)
{
struct stat stat_buf;
if (fstat (file.fd, &stat_buf))
return 0;
file.filesize = stat_buf.st_size;
}
file.handle = abfd;
off_t cur_offset = lseek(file.fd, 0, SEEK_CUR);
claim_file (&file, &claimed);
lseek(file.fd, cur_offset, SEEK_SET);
if (!claimed)
return 0;
return 1;
}
static int
try_load_plugin (const char *pname, bfd *abfd, int *has_plugin_p)
{
void *plugin_handle;
int tv_size = 4;
struct ld_plugin_tv tv[tv_size];
int i;
ld_plugin_onload onload;
enum ld_plugin_status status;
*has_plugin_p = 0;
plugin_handle = dlopen (pname, RTLD_NOW);
if (!plugin_handle)
{
(*_bfd_error_handler)("%s\n", dlerror ());
return 0;
}
onload = dlsym (plugin_handle, "onload");
if (!onload)
goto err;
i = 0;
tv[i].tv_tag = LDPT_MESSAGE;
tv[i].tv_u.tv_message = message;
++i;
tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
tv[i].tv_u.tv_register_claim_file = register_claim_file;
++i;
tv[i].tv_tag = LDPT_ADD_SYMBOLS;
tv[i].tv_u.tv_add_symbols = add_symbols;
++i;
tv[i].tv_tag = LDPT_NULL;
tv[i].tv_u.tv_val = 0;
status = (*onload)(tv);
if (status != LDPS_OK)
goto err;
*has_plugin_p = 1;
abfd->plugin_format = bfd_plugin_no;
if (!claim_file)
goto err;
if (!try_claim (abfd))
goto err;
abfd->plugin_format = bfd_plugin_yes;
return 1;
err:
return 0;
}
/* There may be plugin libraries in lib/bfd-plugins. */
static int has_plugin = -1;
static const bfd_target *(*ld_plugin_object_p) (bfd *);
static const char *plugin_name;
void
bfd_plugin_set_plugin (const char *p)
{
plugin_name = p;
has_plugin = p != NULL;
}
/* Return TRUE if a plugin library is used. */
bfd_boolean
bfd_plugin_specified_p (void)
{
return has_plugin > 0;
}
extern const bfd_target plugin_vec;
/* Return TRUE if TARGET is a pointer to plugin_vec. */
bfd_boolean
bfd_plugin_target_p (const bfd_target *target)
{
return target == &plugin_vec;
}
/* Register OBJECT_P to be used by bfd_plugin_object_p. */
void
register_ld_plugin_object_p (const bfd_target *(*object_p) (bfd *))
{
ld_plugin_object_p = object_p;
}
static int
load_plugin (bfd *abfd)
{
char *plugin_dir;
char *p;
DIR *d;
struct dirent *ent;
int found = 0;
if (!has_plugin)
return found;
if (plugin_name)
return try_load_plugin (plugin_name, abfd, &has_plugin);
if (plugin_program_name == NULL)
return found;
plugin_dir = concat (BINDIR, "/../lib/bfd-plugins", NULL);
p = make_relative_prefix (plugin_program_name,
BINDIR,
plugin_dir);
free (plugin_dir);
plugin_dir = NULL;
d = opendir (p);
if (!d)
goto out;
while ((ent = readdir (d)))
{
char *full_name;
struct stat s;
int valid_plugin;
full_name = concat (p, "/", ent->d_name, NULL);
if (stat(full_name, &s) == 0 && S_ISREG (s.st_mode))
found = try_load_plugin (full_name, abfd, &valid_plugin);
if (has_plugin <= 0)
has_plugin = valid_plugin;
free (full_name);
if (found)
break;
}
out:
free (p);
if (d)
closedir (d);
return found;
}
static const bfd_target *
bfd_plugin_object_p (bfd *abfd)
{
if (ld_plugin_object_p)
return ld_plugin_object_p (abfd);
if (abfd->plugin_format == bfd_plugin_uknown && !load_plugin (abfd))
return NULL;
return abfd->plugin_format == bfd_plugin_yes ? abfd->xvec : NULL;
}
/* Copy any private info we understand from the input bfd
to the output bfd. */
static bfd_boolean
bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED,
bfd *obfd ATTRIBUTE_UNUSED)
{
BFD_ASSERT (0);
return TRUE;
}
/* Copy any private info we understand from the input section
to the output section. */
static bfd_boolean
bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,
asection *isection ATTRIBUTE_UNUSED,
bfd *obfd ATTRIBUTE_UNUSED,
asection *osection ATTRIBUTE_UNUSED)
{
BFD_ASSERT (0);
return TRUE;
}
/* Copy any private info we understand from the input symbol
to the output symbol. */
static bfd_boolean
bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED,
asymbol *isymbol ATTRIBUTE_UNUSED,
bfd *obfd ATTRIBUTE_UNUSED,
asymbol *osymbol ATTRIBUTE_UNUSED)
{
BFD_ASSERT (0);
return TRUE;
}
static bfd_boolean
bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, PTR ptr ATTRIBUTE_UNUSED)
{
BFD_ASSERT (0);
return TRUE;
}
static char *
bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
{
BFD_ASSERT (0);
return NULL;
}
static int
bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
{
BFD_ASSERT (0);
return 0;
}
static int
bfd_plugin_core_file_pid (bfd *abfd ATTRIBUTE_UNUSED)
{
BFD_ASSERT (0);
return 0;
}
static long
bfd_plugin_get_symtab_upper_bound (bfd *abfd)
{
struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
long nsyms = plugin_data->nsyms;
BFD_ASSERT (nsyms >= 0);
return ((nsyms + 1) * sizeof (asymbol *));
}
static flagword
convert_flags (const struct ld_plugin_symbol *sym)
{
switch (sym->def)
{
case LDPK_DEF:
case LDPK_COMMON:
case LDPK_UNDEF:
return BSF_GLOBAL;
case LDPK_WEAKUNDEF:
case LDPK_WEAKDEF:
return BSF_GLOBAL | BSF_WEAK;
default:
BFD_ASSERT (0);
return 0;
}
}
static long
bfd_plugin_canonicalize_symtab (bfd *abfd,
asymbol **alocation)
{
struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
long nsyms = plugin_data->nsyms;
const struct ld_plugin_symbol *syms = plugin_data->syms;
static asection fake_section;
static asection fake_common_section;
int i;
fake_section.name = ".text";
fake_common_section.flags = SEC_IS_COMMON;
for (i = 0; i < nsyms; i++)
{
asymbol *s = bfd_alloc (abfd, sizeof (asymbol));
BFD_ASSERT (s);
alocation[i] = s;
s->the_bfd = abfd;
s->name = syms[i].name;
s->value = 0;
s->flags = convert_flags (&syms[i]);
switch (syms[i].def)
{
case LDPK_COMMON:
s->section = &fake_common_section;
break;
case LDPK_UNDEF:
case LDPK_WEAKUNDEF:
s->section = bfd_und_section_ptr;
break;
case LDPK_DEF:
case LDPK_WEAKDEF:
s->section = &fake_section;
break;
default:
BFD_ASSERT (0);
}
s->udata.p = (void *) &syms[i];
}
return nsyms;
}
static void
bfd_plugin_print_symbol (bfd *abfd ATTRIBUTE_UNUSED,
PTR afile ATTRIBUTE_UNUSED,
asymbol *symbol ATTRIBUTE_UNUSED,
bfd_print_symbol_type how ATTRIBUTE_UNUSED)
{
BFD_ASSERT (0);
}
static void
bfd_plugin_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
asymbol *symbol,
symbol_info *ret)
{
bfd_symbol_info (symbol, ret);
}
/* Make an empty symbol. */
static asymbol *
bfd_plugin_make_empty_symbol (bfd *abfd)
{
asymbol *new_symbol = bfd_zalloc (abfd, sizeof (asymbol));
if (new_symbol == NULL)
return new_symbol;
new_symbol->the_bfd = abfd;
return new_symbol;
}
static int
bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED,
struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
BFD_ASSERT (0);
return 0;
}
const bfd_target plugin_vec =
{
"plugin", /* Name. */
bfd_target_unknown_flavour,
BFD_ENDIAN_LITTLE, /* Target byte order. */
BFD_ENDIAN_LITTLE, /* Target headers byte order. */
(HAS_RELOC | EXEC_P | /* Object flags. */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
(SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS
| SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags. */
0, /* symbol_leading_char. */
'/', /* ar_pad_char. */
15, /* ar_max_namelen. */
0, /* match priority. */
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
{ /* bfd_check_format. */
_bfd_dummy_target,
bfd_plugin_object_p,
bfd_generic_archive_p,
_bfd_dummy_target
},
{ /* bfd_set_format. */
bfd_false,
bfd_false,
_bfd_generic_mkarchive,
bfd_false,
},
{ /* bfd_write_contents. */
bfd_false,
bfd_false,
_bfd_write_archive_contents,
bfd_false,
},
BFD_JUMP_TABLE_GENERIC (bfd_plugin),
BFD_JUMP_TABLE_COPY (bfd_plugin),
BFD_JUMP_TABLE_CORE (bfd_plugin),
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
BFD_JUMP_TABLE_SYMBOLS (bfd_plugin),
BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
BFD_JUMP_TABLE_WRITE (bfd_plugin),
BFD_JUMP_TABLE_LINK (bfd_plugin),
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
NULL,
NULL /* backend_data. */
};
#endif /* BFD_SUPPORTS_PLUGIN */